Two - I agree, but it's a dang toilet. This is NOT rocket science, or flooring or foundations. We're talking about a valve in a toilet. If I install the kit wrong, it leaks from the base of the tank. If it's running, perhaps a siphon issue. Otherwise the flapper is leaking at the base of the tank. The flapper and the rubber base are wear items. They sit in water of unknown chemical content and then start to "leak" because they cannot make a good seal.
I'm not bitching - just trying to understand the issue with the OP. The metal frame is pretty, but this all comes down to the valve assembly.
It’s a valve in the plumbing system, not just the toilet. Like I said, other conditions within the plumbing system can cause a toilet ballcock to fail. It’s not always the ballcocks fault.